US7959653B2 - Spinal rod cross connector - Google Patents
Spinal rod cross connector Download PDFInfo
- Publication number
- US7959653B2 US7959653B2 US11/217,787 US21778705A US7959653B2 US 7959653 B2 US7959653 B2 US 7959653B2 US 21778705 A US21778705 A US 21778705A US 7959653 B2 US7959653 B2 US 7959653B2
- Authority
- US
- United States
- Prior art keywords
- pad
- connector
- bore
- shank
- elongate member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related, expires
Links
- 230000008878 coupling Effects 0.000 claims abstract description 33
- 238000010168 coupling process Methods 0.000 claims abstract description 33
- 238000005859 coupling reaction Methods 0.000 claims abstract description 33
- 230000007704 transition Effects 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 4
- 230000001154 acute effect Effects 0.000 description 3
- 241000251468 Actinopterygii Species 0.000 description 1
- 208000000875 Spinal Curvatures Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000008733 trauma Effects 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
- A61B17/7049—Connectors, not bearing on the vertebrae, for linking longitudinal elements together
- A61B17/7052—Connectors, not bearing on the vertebrae, for linking longitudinal elements together of variable angle or length
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/22—Miscellaneous
Definitions
- the present invention relates to devices useful in correcting spinal abnormalities and, more particularly, the invention is related to a cross connector that enhances the rigidity and stability of the devices useful in correcting spinal abnormalities.
- spinal abnormalities may be correctable using a pair of posterior spinal fixation rods attached to the vertebrae using pedicle screws and the like.
- One such spinal fixation system is described in co-pending, related application Ser. No. 10/915,902 mentioned above.
- the pair of elongated rods often includes cross-connecting devices.
- the cross connecting devices typically traverse the spinal column and couple to each of the elongated rods.
- the cross connecting devices are perpendicular or substantially perpendicular to the spinal column.
- the cross connecting devices typically comprises at least two separate portions that couple together to compensate for these deviations.
- a coupling device must be provided that has a plurality of degrees of freedom so the cross connecting devices can be rotationally, angularly, and vertically oriented to compensate for the deviations.
- the cross connecting device includes a bar arm coupled to one of a pair of posterior rods or spinal fixation rods and a rod arm coupled to the other of the pair of the rods.
- the bar arm and rod arm are coupled together by a connector or coupling device.
- the coupling device has a shank extending through a bore in the bar arm and a connector bore through which a protrusion on the bar arm extends.
- the bar arm is rotationally movable in the connector bore.
- the shank is rotationally and translationally movable in the bar arm bore.
- the coupling device is vertically movable through the bore.
- the protrusion is rotationally and translationally movable in the connector bore.
- FIG. 1 is a top perspective view of a cross connect device consistent with an embodiment of the present invention
- FIG. 2A is a top perspective view of the first part 104 a of the cross connect device of FIG. 1 ;
- FIG. 2B is a bottom perspective view of the first part 104 a of the cross connect device of FIG. 1 ;
- FIG. 3 a is a top perspective view of connecting end 124 of first part 104 a shown in FIG. 2 ;
- FIG. 4 is a top perspective view of a second part 104 b of the cross connect device of FIG. 1 ;
- FIG. 5 is a perspective view of a bolt 106 b of the cross connect device of FIG. 1 ;
- FIG. 6 is a cross sectional view of first part 104 a and coupling device 106 of FIG. 1 ;
- FIG. 7 is a top perspective view of a nut 106 a of the cross connect device of FIG. 1 ;
- FIG. 8 is a front elevation view of the cross connect device of FIG. 1 ;
- FIG. 9 is an elevation view of an alternative construction of the lower socket portion of bolt 106 b ;
- FIG. 10 is a cross sectional view of the lower socket of FIG. 9 .
- the present invention relates to a device that traverses a spinal column to connect a pair of elongated rods being used to correct spinal abnormalities, such as, for example, spinal curvature.
- FIG. 1 a top perspective view of a cross connector 100 is shown.
- Cross connector 100 is shown attached to a pair of elongated spinal fixation rods 102 a and 102 b .
- Spinal fixation rods 102 a and 102 b would be connected to the pedicle portion of vertebral bodies about the spinal column as is generally known in the art (not shown).
- Related application Ser. No. 10/915,902 mentioned above describes a novel device for attaching spinal fixation rods 102 a and 102 b to the pedicles.
- Cross connector 100 comprises at least two independently movable parts coupled together.
- a first part 104 a sometimes referred to as bar arm 104 a , connected to spinal fixation rod 102 a and a second part 104 b , sometimes referred to as rod arm 104 b , connected to spinal fixation rod 104 b .
- Bar arm 104 a is shown in more detail in FIGS. 2A , 2 B, and 3 .
- Rod arm 104 b is shown in more detail in FIG. 4 .
- Bar arm 104 a is coupled to second part 104 b using a coupling device 106 .
- Coupling device 106 comprises a nut 106 a and a bolt 106 b .
- Coupling device 106 is shown in more detail in FIGS. 5-7 .
- Bar arm 104 a has a hook 108 a that has an inner surface 110 a shaped to cooperatively engage spinal fixation rod 102 a . While referred to as hook 108 a because the particular embodiment is shaped as similar to a fish hook, one of ordinary skill in the art would recognize that hook is used generically to refer to numerous shapes. In this case, inner surface 110 a has a concave shape to provide a surface-to-surface engagement with a convexly shaped rod 102 a . An outer surface 110 c of hook 108 a does not need to be convexly shaped as shown, but it is believed the smooth curve would reduce trauma.
- first arm 112 a traversing a portion of the spinal column (not shown).
- First arm 112 a is shown with a generally cubic shape, but other shapes are possible.
- first rod grip insert or cross connector pad 114 a (sometimes referred to as simply pad 114 a ).
- Pad 114 a is somewhat moveable between a grip position (as shown) and a release position.
- Pad 114 a has a rod contact surface 116 a shaped to cooperatively engage spinal fixation rod 102 a and a setscrew contact surface 118 a shaped to cooperatively engage a first setscrew 120 a .
- First setscrew 120 a is threadable into a first bore 122 a traversing first arm 112 a at an acute angle ⁇ (shown in FIG. 2 ). First setscrew 120 a can be tightened to impinge on setscrew contact surface 118 a to cause pad 114 a to engage rod 102 a such that rod contact surface 116 a provides a surface-to-surface contact between rod contact surface 116 a , and spinal fixation rod 102 a .
- first setscrew 120 a impinging on setscrew contact surface 118 a tends to cause first rod grip insert 114 a to transmit compressive force to spinal fixation rod 102 a to seat spinal fixation rod 102 a on first inner surface 110 a , which provides another surface-to-surface contact that is between rod 102 a and first inner surface 110 a.
- Bar arm 104 a provides a stable connection for cross connector 100 to rod 102 a through the at least the two surface-to-surface contacts identified.
- Reverse threading setscrew 120 a allows pad 114 a to be moved to the release position such that cross connecting device 100 can be fitted or removed from spinal fixation rod 102 a .
- reverse threading setscrew 120 a releases the compressive force tending to seat the construct.
- pad 114 a may be coupled to first part 104 a using a channel, slot, or groove 130 that provides a plurality of positions for first rod grip insert 114 a.
- pad 114 a disposed in slot 130 to provide for the plurality of positions for first rod grip insert 114 a .
- groove 130 may be provided with a ledge 130 a or other engagement surface for movement of pad 114 a between a grip position and a release position with respect to a spinal fixation rod.
- pads 114 a , 114 b may each include a necked-down portions 114 c , 114 d , respectively.
- Necked-down portion 114 d may cooperatively engage with ledge 130 a so as to allow translation of pad 114 b.
- the surface-to-surface contacts between inner surface 110 a and rod contact surface 116 a provide a clamp type of coupling between first part 104 a and spinal fixation rod 102 a .
- the clamp type coupling allows first part 104 a to be rotated about a longitudinal axis 1021 a of spinal fixation rod 102 a . This allows multiple angular orientations of the first part or bar arm 104 a relative to the second part or rod arm 104 b.
- first arm 112 a extends from hook 108 a to partially traverse the spinal column in a first plane A.
- First arm 112 a terminates at a connecting end 124 .
- Connecting end 124 comprises a bore 126 extending through first arm 112 a .
- bore 126 comprises a first diameter a and a second diameter b.
- the different diameters provide a shoulder 128 .
- Bore 126 and shoulder 128 define a recess 302 or chamber as will be explained further below.
- Coupling device 106 interacts with recess 302 , or with bore 126 and shoulder 128 , as will be explained below.
- Rod arm 104 b has parts similar to bar arm 104 a .
- the similar parts include a second hook 108 b , a second inner surface 110 b , a second rod grip insert 114 b with a rod contact surface 116 a and a setscrew contact surface 118 b , a second setscrew 120 b , a second bore 122 b , and channel 130 .
- Setscrew bore 122 b forms an acute angle ⁇ with second arm 112 b . While bores 122 a and 122 b are shown forming identical angles ⁇ , they could form different angles as desired.
- rod arm 104 b has a plane traversing surface 402 such that second arm 112 b extends from traversing surface 402 in plane B to partially traverse the spinal column.
- Traversing surface 402 may extend from hook 108 b to second arm 112 b at an acute angle, but could be at a right angle or more.
- Plane traversing surface 402 could be employed to bar arm 104 a and first arm 112 a .
- Second arm 112 b terminates in a male shank portion 132 , which couples to coupling device 106 as will be explained further below.
- second arm 112 b is shown substantially cylindrical, but as will be explained further below, only the male shank portion 132 needs to be cylindrical in this embodiment.
- Male shank portion 132 may comprises a protrusion 134 such as a detent, lip, shoulder, or ridge at a distal portion of shank portion 132 .
- Protrusion 134 inhibits second arm 112 b from decoupling from coupling device 106 .
- first arm 112 a and second arm 112 b have an overlapping region 802 (best seen in FIG. 8 ).
- Spinal fixation rod arm 102 b is contained in a clamp like coupling by hook 108 b (specifically surface 110 a ) and pad 114 b (specifically surface 116 b ). The clamp like coupling allows rod arm 102 b to pivot about a longitudinal axis 1021 b of spinal fixation rod 102 b.
- FIGS. 2A and 2B show a top and bottom perspective view of bar arm 104 a from FIG. 1 .
- FIGS. 2A and 2B show parts identified above that will not be re-described herein.
- FIG. 3 shows a bottom perspective view of bore 126 , shoulder 128 , and recess 302 in more detail.
- FIG. 4 shows a top perspective view of rod arm 104 b from FIG. 1 .
- FIG. 4 shows parts identified above that will not be re-described herein.
- Bolt 106 b comprises an upper shank 502 , a lower socket 504 , and a transition portion 506 .
- Upper shank 502 has a threaded outer surface 508 and an inner surface 510 shaped to cooperatively engage a counter torque tool (not specifically shown).
- Inner surface 510 is optional and other types of counter torque devices generally known in the art or no counter torque device is possible.
- Lower socket 504 has a connector bore 512 that is shaped to slidably engage male shank portion 132 .
- Upper shank 502 extends through bore 126 such that at least a portion of the threaded outer surface 508 extends from arm 112 a (best seen in FIG. 6 ). Outer surface 508 could be completely threaded or partially threaded as a matter of design choice. Upper shank 502 is sized to rotatably move in bore 126 .
- upper shank 502 has an inner surface 510 designed to cooperatively engage a counter torque tool.
- nut 106 a is threaded on upper shank 502 using sufficient torque to provide a sufficient seat between bar arm 104 a and rod arm 104 b .
- This torque tends to cause device 100 to want to twist or walk along spinal fixation rods 102 .
- a surgeon would use the counter torque tool to engage upper shank 502 .
- the counter torque tool would tend to resist the torque applied to nut 106 a reducing the twisting or walking.
- Transition portion 506 provides a transition from the wider lower socket 504 to the narrower upper shank 502 .
- Transition portion 506 is shown as a flat surface, but could take a number of shapes. As shown best in FIG. 6 and will be explained further below, a gap 602 resides between transition portion 506 and shoulder 128 , the reasons for which will be explained below.
- Nut 106 a (shown in FIG. 7 ) has a threaded inner surface 702 , an outer surface tool-engaging surface 704 , and a bar arm contact surface 706 . Nut 106 a is threaded on upper shank 502 until bar arm contact surface 706 contacts first arm 112 a.
- orientation of the pair of spinal fixation rods 102 can be accommodated in various ways.
- sliding male shank portion 132 in bore 512 can accommodate distance changes between rod 102 a and 102 b .
- Rotating male shank 132 in bore 512 compensates for angular differences between corresponding longitudinal axes 1021 a and 1021 b of spinal fixation rods 102 a and 102 b , respectively. This causes overlapping portion 802 to increase or decrease as necessary.
- Rotating coupling device 106 in bore 126 accommodates angular orientation differences between rods 102 .
- Tightening nut 106 a on bolt 106 b causes bolt 106 b to move into recess 302 until a surface 806 on rod arm 112 b contact a lower edge 802 of bore 126 accommodating height differences.
- Angling first and second arms 112 to diverge or converge if necessary can accommodate height differences.
- planes A and B are not necessarily parallel planes.
- male shank portion 132 is designed with a shape to cooperatively engage bore 512 to allow for rotational, slidable engagement of male shank portion 132 .
- male shank portion 132 and bore 512 do not need to be cylindrical in shape.
- a square bore 908 is shown that would cooperatively engage a square male shank portion (not specifically shown, but generally similar to male shank portion 132 except for shape).
- bore 908 would be a part of a bolt 900 having a bore holder 902 holding a bore nut 904 (bore 912 resides in bore nut 904 .
- a channel 906 in bore holder 902 rotationally engages bore nut 904 so the male shank portion can be rotationally oriented within bolt 900 .
Abstract
Description
Claims (11)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US11/217,787 US7959653B2 (en) | 2004-09-03 | 2005-08-31 | Spinal rod cross connector |
PCT/US2005/031253 WO2006028950A2 (en) | 2004-09-03 | 2005-09-01 | Spinal rod cross connector |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US60723104P | 2004-09-03 | 2004-09-03 | |
US11/217,787 US7959653B2 (en) | 2004-09-03 | 2005-08-31 | Spinal rod cross connector |
Publications (2)
Publication Number | Publication Date |
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US20060064093A1 US20060064093A1 (en) | 2006-03-23 |
US7959653B2 true US7959653B2 (en) | 2011-06-14 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/217,787 Expired - Fee Related US7959653B2 (en) | 2004-09-03 | 2005-08-31 | Spinal rod cross connector |
Country Status (2)
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US (1) | US7959653B2 (en) |
WO (1) | WO2006028950A2 (en) |
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US20100185285A1 (en) * | 2009-01-19 | 2010-07-22 | Richard Perkins | Annular repair device and method |
US20110307012A1 (en) * | 2009-03-31 | 2011-12-15 | Mir Hamid R | Spinous Process Cross-Link |
US20120158064A1 (en) * | 2010-12-21 | 2012-06-21 | Matthew Kroll | Curved spinal cross-connector |
US20140107705A1 (en) * | 2008-08-08 | 2014-04-17 | Alphatec Spine, Inc. | Spinous process device and method of use |
US8828058B2 (en) | 2008-11-11 | 2014-09-09 | Kspine, Inc. | Growth directed vertebral fixation system with distractible connector(s) and apical control |
US8920472B2 (en) | 2011-11-16 | 2014-12-30 | Kspine, Inc. | Spinal correction and secondary stabilization |
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WO2006028950A3 (en) | 2006-05-04 |
US20060064093A1 (en) | 2006-03-23 |
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